Spiral pipe



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C. G. NAYLOR SPIRAL APIPE Fild NOV. '7. 1921 patented CAR/L G. NAYLE, @ECEEIGAG, EToLlilS, ASSGNR T@ NAYLR-XUBERTSONGUMPANY.

' A FJPBATON OIF DELAWARE.

ernaar. rrrn lpplieation flied November 7, 1921. Serial No. 513,377.

To all whom t may; concern.'

Be it known that l, CARL G. Narnon, a citizen of the United States,residing at Chicago, in the county of Cook and State of illinois, haveinvented certain new and useful Improvements in Spiral Pipes, of whichthe following is a specification.

rlhis invention relates to spiral pipe.

One of the objects of the invention is to provide an improved spiralpipe.

Another object is to provide a spiral pipe particularly adapted toconvey liquids and gases under high pressure.

'Another object isto provide a method of making the pipe.

Another object is to provide an improved machine for making the pipe.

Another object is to provide a spiral pipe having an improved lock seam.

@ther objects and advantages will hereinafter appear.

ln the accompanying drawing Fig. 1 is an end elevation of a portion of`a machine for making they improved pipe,

and

Fig. 2 is a cross section through the improved joint or seam.

A machine for making ordinary spiral ipe is set forth in 'United StatesLetters atent No. 1,288,134, granted December 17, 1918.v A machine suchas disclosed in the aforesaid patent may be modified to produce the pipeand practice the method hereinafter` set forth.

The improved pipe is produced by incorpoi-ating a compressible aching,for example an impregnated text1le in the form of a cord or rope, in thespiral lock-seam interconnecting adjacent convolutions of the metalstrip forming the ipe.

The machine in which t e pipe is formed has, in eneral, a rotatableaxially movable mandrelgl upon which a strip or ribbon 2 of metal isspirally wound. The strip is drawn through a series of pairs of rollers3, 4, 5 and G which serve to form a bead and a flange, respectively,along the opposite edges thereof. The flanged and beaded strip is thendrawn over the rotating and axially moving` mandrel. As the strip isdrawn into a spiral upon the mandrel a series of seam forming rollers 7,8, 9 and 10 serve to interlock the bead and flange along the adjacentedges of adjacent convolutions of the strip and to form and press the'same together into an external `rigid spiral lock-seam.

rl`he details of the construction and operation of such a machine aresetforth in the patent previously referred to.

To form the improved pipe the machine is caused to draw upon the mandreland include and incorporate into the spiral locksearn a compressiblepacking strip, such for example, as an impregnate textile cordv or rope.The machine is provided with a hopper 12 for holding a suitableimpregnating water-proof substance, such as an asphaltum compound. lhiscompound is maintained in a heated liquid state oy any suitable meanssuoli' as a burner or steam coil. The rope or cord passes over suitablerollers through the oath of the heated liquid and between the flange andhead of adjacent convolutions of the metal strip. The loch-seam formingrollers form and press the head and flange about the cord or rope.

The textile thus becomes an integral part of thel rigid spirallock-scamforming, in eect, a packing core therefor. The core ispreferably compressed or compacted in the seam forming process toincrease its density or till any spaces which may occur and provide anexceedingly tight and dependable joint.

Fig. 2 shows a cross section of the spiral lock-seam produced. The twoedges 13 and 14 of thestrip are interlocked about cord 11 which iscompletely surrounded and protected by metal and held in a compactedpacking mass completely sealin the joint.

Having described my invention what l claim as new and desire to secureby Letters Patent, is

1. The process of making pipe from a ribbon of metal which consists inwinding the ribbon into a series of spirally related convolutions, riidly interlockin edges of adjacent convo utions of the rib on to form acontinuous spiral lock-seam, heating and including a continuous strip of,impregnated compressible packin r within the rigid lockseam as the sameis lformed 2. The process of making pipe from a metallic strip whichconsists in winding the strip into a series of spirally relatedconvolutions, heating and impregnating a strip of compressible packingwith adjacent ed es of adjacent convolutions of the meta ic strip, andbending the adjacent edges of adjacent convolutions of the metallicstrip about the strip of packing and each other to form a rigid7 packedcontinuous spiral lock-seam.

3. A spiral pipe' comprising a tube formed from a spirally woundmetallic strip, a `rigid continuous splral lock-seamjoining adjacentedges of adjacent convolutions of the spiral', and a compressiblcpacking saturated with Water resisting plastic material incorporated inthe lock-seam 4. A spiral pipe comprising a tube formed from a strip ofmetal bent into spiralled convolutions, a lock-seam interconnectingadjacent edges of adjacent convolutions of the invasor metal strip, anda cord impregnated with a water resisting plastic material compressedwithin and surrounded by the lock-seam to produce a tight joint.

5. A.4 pipe seam formed between adjacent strips of sheet metal in whichthe 1ongitu dinal edge of one stri is bent outwardly and folded uponitse f; the longitudinal edge. of the adjacent strip laid over and underthe edge of the first mentioned strip, and a compressible packing underthe fold of one-strip and adjacent the end of the other edge. j

ln testimony whereof I hereunto subscribe my name.

CARL G. NAYLOR.

